They're talking about pieces of dialogue in the show, not licensed music.
First, licensing arrangements for "all marketing channels" only account for the channels that exist at the time. When a new market channel opens up, such as streaming, music labels will require new licensing terms for that channel. If they don't, they might not get paid. (TV & movie studios are just as ruthless as music labels).
Second, in turn, the labels often have to get new permission from artists for the new channel. Tracking down all artists can be a challenge and require resources that they can't recoup.
Maybe that was a thing with the new reboot? I don't know because I heard nothing that made me want to watch it.